在C# ASP.NET中添加不支持HTML体的电子邮件上的ICal

using System.Net.Mail;

// 创建MailMessage对象
MailMessage mail = new MailMessage();
mail.From = new MailAddress("sender@example.com");
mail.To.Add("recipient@example.com");
mail.Subject = "Meeting Invitation";

// 创建iCal文件并保存到本地
string iCalContent = "BEGIN:VCALENDAR\r\n" +
                     "VERSION:2.0\r\n" +
                     "PRODID:-//Your Company//Your App//EN\r\n" +
                     "BEGIN:VEVENT\r\n" +
                     "DTSTART:20220101T090000\r\n" +
                     "DTEND:20220101T100000\r\n" +
                     "SUMMARY:Meeting\r\n" +
                     "DESCRIPTION:Please attend the meeting.\r\n" +
                     "LOCATION:Conference Room\r\n" +
                     "END:VEVENT\r\n" +
                     "END:VCALENDAR";

string iCalFilePath = "path/to/your/iCal.ics";
System.IO.File.WriteAllText(iCalFilePath, iCalContent);

// 添加iCal文件作为附件
Attachment iCalAttachment = new Attachment(iCalFilePath);
mail.Attachments.Add(iCalAttachment);

// 设置电子邮件内容为纯文本
mail.IsBodyHtml = false;
mail.Body = "Please see the attached iCal file for meeting details.";

// 使用SMTP服务器发送电子邮件
SmtpClient smtpClient = new SmtpClient("your-smtp-server");
smtpClient.Send(mail);